Variation of wake patterns and force coefficients of the flow past square bodies aligned inline

Manzoor, Raheela; Shams-ul-Islam,; Abbasi, Waqas Sarwar; Parveen, Sajida

doi:10.1007/s12206-016-0325-0

Cited by 13 publications

(8 citation statements)

References 37 publications

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“…In such case the flow characteristics become different from those in the case of single spacing. This interesting feature of fluid structure interaction has also been investigated by many researchers [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Transition from steady to unsteady state flow around two inline cylinders under the effect of Reynolds numbers

Abbasi

Islam

2018

J Braz. Soc. Mech. Sci. Eng.

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Numerical computations are carried out to analyze the transition in flow states around two inline square cylinders under the effect of Reynolds numbers (Re). For this analysis, Re is varied from 1 to 110 at a fixed spacing ratio g = 3.5. The results are presented in the form of vorticity contours, streamline graphs, temporal histories of drag and lift coefficients and power spectrum of lift coefficients. Also the physical parameters like average drag coefficient, Strouhal number and the rootmean-square values of drag and lift coefficients are presented as a function of Re. Three different states of flow are found in this study by systematically varying Re: (a) steady state, (b) quasi-unsteady state, and (c) unsteady state. The points of separation and reattachment of shear layers depend on Re. This study shows that the values of physical parameters strongly depend on flow states and change their behavior when flow mode changes from one state to another. A significant reduction in the values of flow induced forces found due to the presence of two cylinders in the flow field when compared to single cylinder values. The results of the present study are also compared with the available data of other researchers and found to be in good agreement.

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Section: Introductionmentioning

confidence: 99%

Transition from steady to unsteady state flow around two inline cylinders under the effect of Reynolds numbers

Abbasi

Islam

2018

J Braz. Soc. Mech. Sci. Eng.

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“…Some more studies related to the analysis of flow around three or more square cylinders arranged inline can be found in Refs. [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of fluid-solid interaction for flow around three square cylinders

et al. 2018

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In this work, fluid-solid interactions are numerically investigated for flow around three equally/unequally spaced square cylinders using the lattice Boltzmann method. Two major trends of shear layers observed for equal gap spacings between cylinders: (i) without roll up (W), and (ii) with roll up (R). While for unequal gap spacings, four major trends of shear layers observed: (i) without roll up in both gaps (WW), (ii) without rollup in first gap and with roll up in second gap (WR), (iii) with roll up in first gap and without roll up in second gap (RW), and (iv) with roll up in both gaps (RR). g = 3 is found to be the critical equal spacing value. Also g = 1.5 is found to be suitable equal spacing in terms of minimum drag force. While the suitable unequal gap spacing combinations found in this study are (g1, g2) = (1.5, 0.5), (g1, g2) = (3, 0.5) and (g1, g2) = (5, 0.5). Results show that flow induced forces can be suppressed by suitable unequal gap spacing combinations.

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“…This is due to the direct reattachment of shear layers from the control plate onto the square cylinder. Manzoor et al [56] had shown similar Figure 11a-d shows the power spectra analysis of lift time history using FFT. It is seen that the Strouhal value almost approaches an isolated cylinder (St = 0.1644) at l/w = 0.7 while increasing the value of l/w.…”

Section: Further Indicate the F Low Transitionsmentioning

confidence: 58%

“…When the separation ratio is large enough, a von-Karman vortex street forms behind both the upstream control plate and square cylinder and called fully developed vortex shedding flow regime (regime-IV). Manzoor et al [56] found that the irregular variation of vortices behind the downstream cylinder indicate the existing of critical gap spacing between the inline cylinders. Figure 6d also shown the irregular variation of vortices behind the downstream main square cylinder.…”

Section: Resultsmentioning

confidence: 99%

Numerical study of reduction of fluid forces acting on a square cylinder using a control plate

Zia-ul-Islam

Shams-ul-Islam

Zhou

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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A numerical study on the effects of control plate on the fluid force reduction on a square cylinder has been carried out using lattice Boltzmann method where a configuration of a square cylinder with upstream control plate is studied. In the present computations we have studied the important flow characteristics for 0.1 ≤ l/w ≤ 1 and 1 ≤ g/D ≤ 10. The effects of the l/w and g/D on force reduction, flow separation and vortex shedding frequency have been studied with Reynolds number focused on 150. Vorticity structures, vortex shedding frequency and fluctuating forces and time-mean are presented and discussed. It was found that considerable change in the wake structure and fluid forces depending on the values of l/w and g/D. The numerical results show that there exists an optimum position where the force coefficients acting on the main square cylinder attains their minimum values. At the optimum position, the mean drag coefficient is reduced by 139.3%. Four different flow regimes were identified in this study at different g/D for selected range of l/w. The negative values of drag coefficient for the main square cylinder are also found for different combinations of l/w and g/D.

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Variation of wake patterns and force coefficients of the flow past square bodies aligned inline

Cited by 13 publications

References 37 publications

Transition from steady to unsteady state flow around two inline cylinders under the effect of Reynolds numbers

Transition from steady to unsteady state flow around two inline cylinders under the effect of Reynolds numbers

Numerical investigation of fluid-solid interaction for flow around three square cylinders

Numerical study of reduction of fluid forces acting on a square cylinder using a control plate

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